Takagi T-D2 and T-D2U Review

An overview of the Indoor and outdoor Takagi T-D2 and T-D2U
tankless
water heaters for homes with two to
four bathrooms. Check out the features that
make T-D2/U models versatile and green.

Model review

Takagi T-D2 models (or 510 series) are coming
from the
non-condensing group of
tankless
water heaters where the energy factor, for both natural gas and propane
models, is
0.82, which is the same as other tankless units from this group.

Takagi
T-D2 heaters are designed as conventional on-demand models while the
T-D2U
models as ultra-low NOx, all used in residential and light commercial
applications.
These models can work as a single unit with the maximum water flow of
10 GPM, which is enough hot water for two to four showers, while when
using the Easy-Link system, up to 4 units can be
manifold into
one system when they generate the maximum flow of 40 GPM.

Ultra-low
NOx,
or T-D2U models can utilize the multi-controller to connect up to 20
units and generate up to 200 GPM of hot water, which makes the units
recommended for
larger homes, restaurants, schools and beauty salons. T-D2 models are
NSF approved so can be used in commercial food industry.

Venting

Takagi
T-D2-IN models are built as the indoor units that can use either 3” or
4” vents with the maximum lengths of 50 feet, and can be converted to
direct vent models with the correct conversion kit. There are also
Takagi T-D2-OS models that do no utilize any venting due to the outdoor
installation.

Built tough

Takagi T-D2/U are built
tough, especially the heat exchanger that is commercial grade and has
the thicker wall than other standard type, and is made of the hardened
copper to sustain higher stress and allow longer life.

Versatility

Takagi
T-D2/U are not made for heating potable water only. Due to its
capability to provide very high water flow and power, it makes them
suitable for use in space heating and recirculation systems. The pump
control port allows efficient operation of the circulation pumps.

Electronics

Takagi
T-D2/U is the advanced type of tankless water heaters and is equipped
with the remote control, which is found as the standard feature on many
Takagi models. When using the remote control you can set the
temperature on the unit in a range from 99F to 185 with the 19 options,
while with the dipswitch setup you have fewer options.

Other safety
features include the overheat cutoff
fuse, hi-limit switch exhaust, water temperature safety control and
freeze
protection system. The safety features are computer monitored and
controlled.

Specification

Models
---
Specifications

T-D2-IN

T-D2-OS

T-D2-IN

T-D2-OS

Power
(Btu/hr)

11,000
199,000

11,000
199,000

15,000
199,000

15,000
199,000

Water Flow
(GPM) @ 30 F rise

10

10

10

10

Energy Factor
EF

0.82

0.82

0.82

0.82

Min. Water Flow
(GPM)

0.5

0.5

0.5

0.5

Activation rate
(GPM)

0.4

0.4

0.4

0.4

Temp. settings
(F)

99-185

99-185

99-185

99-185

Electric consumption
(Watts)

139

138

138

138

Max. vent length
(ft)

50

N/A

50

N/A

Weight
(pounds)

39

39

39

39

Warranty

Takagi
T-D2/U comes with the long warranty; 15 years on heat exchanger if used
in residential applications or 10 years in commercial, and 5 for other
parts.

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